CONSTRUCTOR

Week 4: Writing classes/01a Class and object

@@ -0,0 +1,61 @@
+class defines the 
+- structure of the object's data content and 
+- the operations that can be performed on it
+
+
+use 'class' to model 
+- physical things (such as a student, a car, or a holiday share), 
+- conceptual things (such as a bank account, a student record, a network connection), and 
+- often things that have no real-world equivalent - such as a key-value pair to be used as a parameter
+
+1 class
+- create 1/more objects
+
+
+
+======================================
+
+
+
+Creating objects from class
+
+To construct an object, you call a class's dedicated method, the CONSTRUCTOR. 
+The constructor RETURNS a NEW OBJECT (usually with parameters) - or, in fact, a REFERENCE to a new object. 
+This reference is usually stored in a variable, through which the entity can later be used/changed and observed.
+
+
+For example, to create a new list object, call the ArrayList class constructor:
+
+ArrayList<String> nordics = new ArrayList<>();
+ 
+
+
+The name of the constructor method is always the same as the name of the class. 
+Thus, for example, the 'name of the constructor method' of the 'ArrayList class' is 'ArrayList', and 
+the name of the constructor of the Random class is Random. 
+
+When creating a new object, the 'operator new' is used, which, as its name implies, 
+indicates that the intention is to create a new object from the class.
+
+
+
+In the example, we have initialized the objects of the classes Random and StringBuilder:
+
+import java.util.Random;
+
+public class TestClass {
+    public static void main(String[] args) {
+
+        // class1
+        // New object from the class random
+        Random randomizer = new Random();
+		
+        // class2
+        // New object from the class stringbuilder
+        StringBuilder address = new StringBuilder("Javaroad 12");
+    }
+}
+
+
+
+